1 // SPDX-License-Identifier: GPL-2.0
29 	unsigned int			num_channels;
30 	unsigned int			num_gpios;
31 	int				gain_min;
32 	int				gain_max;
33 	int				default_gain;
39 	struct	gpio_descs *gpios;  member
44 static int hmc425a_write(struct iio_dev *indio_dev, u32 value)  in hmc425a_write()
51 	gpiod_set_array_value_cansleep(st->gpios->ndescs, st->gpios->desc,  in hmc425a_write()
56 static int hmc425a_read_raw(struct iio_dev *indio_dev,  in hmc425a_read_raw()
57 			    struct iio_chan_spec const *chan, int *val,  in hmc425a_read_raw()
58 			    int *val2, long m)  in hmc425a_read_raw()
61 	int code, gain = 0;  in hmc425a_read_raw()
62 	int ret;  in hmc425a_read_raw()
64 	mutex_lock(&st->lock);  in hmc425a_read_raw()
67 		code = st->gain;  in hmc425a_read_raw()
69 		switch (st->type) {  in hmc425a_read_raw()
71 			gain = ~code * -500;  in hmc425a_read_raw()
81 		ret = -EINVAL;  in hmc425a_read_raw()
83 	mutex_unlock(&st->lock);  in hmc425a_read_raw()
88 static int hmc425a_write_raw(struct iio_dev *indio_dev,  in hmc425a_write_raw()
89 			     struct iio_chan_spec const *chan, int val,  in hmc425a_write_raw()
90 			     int val2, long mask)  in hmc425a_write_raw()
93 	struct hmc425a_chip_info *inf = st->chip_info;  in hmc425a_write_raw()
94 	int code = 0, gain;  in hmc425a_write_raw()
95 	int ret;  in hmc425a_write_raw()
98 		gain = (val * 1000) - (val2 / 1000);  in hmc425a_write_raw()
102 	if (gain > inf->gain_max || gain < inf->gain_min)  in hmc425a_write_raw()
103 		return -EINVAL;  in hmc425a_write_raw()
105 	switch (st->type) {  in hmc425a_write_raw()
111 	mutex_lock(&st->lock);  in hmc425a_write_raw()
114 		st->gain = code;  in hmc425a_write_raw()
116 		ret = hmc425a_write(indio_dev, st->gain);  in hmc425a_write_raw()
119 		ret = -EINVAL;  in hmc425a_write_raw()
121 	mutex_unlock(&st->lock);  in hmc425a_write_raw()
126 static int hmc425a_write_raw_get_fmt(struct iio_dev *indio_dev,  in hmc425a_write_raw_get_fmt()
134 		return -EINVAL;  in hmc425a_write_raw_get_fmt()
170 		.gain_min = -31500,
172 		.default_gain = -0x40, /* set default gain -31.5db*/
176 static int hmc425a_probe(struct platform_device *pdev)  in hmc425a_probe()
180 	int ret;  in hmc425a_probe()
182 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));  in hmc425a_probe()
184 		return -ENOMEM;  in hmc425a_probe()
187 	st->type = (uintptr_t)device_get_match_data(&pdev->dev);  in hmc425a_probe()
189 	st->chip_info = &hmc425a_chip_info_tbl[st->type];  in hmc425a_probe()
190 	indio_dev->num_channels = st->chip_info->num_channels;  in hmc425a_probe()
191 	indio_dev->channels = st->chip_info->channels;  in hmc425a_probe()
192 	indio_dev->name = st->chip_info->name;  in hmc425a_probe()
193 	st->gain = st->chip_info->default_gain;  in hmc425a_probe()
195 	st->gpios = devm_gpiod_get_array(&pdev->dev, "ctrl", GPIOD_OUT_LOW);  in hmc425a_probe()
196 	if (IS_ERR(st->gpios))  in hmc425a_probe()
197 		return dev_err_probe(&pdev->dev, PTR_ERR(st->gpios),  in hmc425a_probe()
198 				     "failed to get gpios\n");  in hmc425a_probe()
200 	if (st->gpios->ndescs != st->chip_info->num_gpios) {  in hmc425a_probe()
201 		dev_err(&pdev->dev, "%d GPIOs needed to operate\n",  in hmc425a_probe()
202 			st->chip_info->num_gpios);  in hmc425a_probe()
203 		return -ENODEV;  in hmc425a_probe()
206 	ret = devm_regulator_get_enable(&pdev->dev, "vcc-supply");  in hmc425a_probe()
210 	mutex_init(&st->lock);  in hmc425a_probe()
212 	indio_dev->info = &hmc425a_info;  in hmc425a_probe()
213 	indio_dev->modes = INDIO_DIRECT_MODE;  in hmc425a_probe()
215 	return devm_iio_device_register(&pdev->dev, indio_dev);  in hmc425a_probe()